What is a battery insulation fault diagnosis scheme?

An effective insulation fault diagnosis scheme is of great significance in ensuring the operation of the battery pack. In this work, a battery insulation detection scheme based on an adaptive filtering algorithm is proposed. Firstly, an insulation resistance detection scheme based on signal injection is designed.

How to verify the effectiveness of insulation detection scheme?

In order to verify the effectiveness of the proposed insulation detection scheme, the constant voltage variable resistance working condition is set here. The voltage of the battery pack remains constant, and the insulation resistance jumps periodically to simulate a sudden insulation fault.

What is insulation detection method based on square wave voltage signal injection?

An insulation detection method based on square wave voltage signal injection is proposed in Ref. . The Lyapunov observer is used to estimate insulation resistance. To better deal with the system noise, the insulation detection scheme based on the filtering algorithm is proposed in Refs. , .

What is insulation fault detection scheme?

Insulation fault detection scheme: (a) Insulation detection topology. (b) Schematic diagram of an insulation fault. For the battery pack, the maximum leakage current is most likely to occur at the electrode position . The insulation resistance between electrodes and the chassis determines the insulation performance of the battery system.

How to detect insulation resistance in a DC system?

Therefore, effective and timely insulation fault monitoring is critical to the safe operation of the system. Researchers have put forward various detection schemes for the insulation resistance detection of DC systems, which can be summarized as the direct measurement method, bridge balance method and signal injection method.

What is a battery insulation detection equivalent circuit model?

The battery insulation detection equivalent circuit model, which employs a low-frequency signal injection method in the battery pack, is depicted in Figure 3. The diagram presents the essential configuration of an electric vehicle’s high-power supply, comprising the battery circuit module, inverter, motor, disconnectors, and vehicle chassis.